How Can Retrofit 2.0 Parse Nested JSON Object

Parse a nested json with retrofit 2.0

Root node of your json is not array, but you declared it as List<responseStatus> at interface getPost. So you need to use responseStatus instead current one. And use gettter to access data

@SerializedName("data")
private ArrayList<retroPost> data;

which is array

How can Retrofit 2.0 parse nested JSON object?

Assuming your complete JSON looks like

{
  "title": "Recent Uploads tagged android",
  "link": "https://www.flickr.com/photos/tags/android/",
  "description": "",
  "modified": "2015-10-05T05:30:01Z",
  "generator": "https://www.flickr.com/",
  "items": [
    {
      "member1": "memeber value",
      "member2": "member value"
    },
    {
      "member1": "memeber value",
      "member2": "member value"
    }
  ]
}

So Pojo classes would be

public class MainPojo {
    private String title; 
    private String description;
    private String link;
    private String generator;
    private String modified;
    private ArrayList<Items> items;

    // Getters setters
}

public class Items {
    private String member2;
    private String member1;

    // Getters setters
}

Note : This is similar solution for your JSON. Members of Items.java can be changed if JSON has other keys.

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Update for Pojo as new JSON

public class Items {
    private String tags;
    private String author;
    private String title;
    private String description;
    private String link;
    private String author_id;
    private String published;
    private Media media;

    // Getters and Setters
}

public class Media {
    private String m;
    // Getters and Setters
}

How to parse nested JSON object with Retrofit/Moshi

I found out the reason why I was not getting any response.
In my UpdateFragment, I'm doing this:

            //Get description and image from API
            mBookViewModel.response.observe(viewLifecycleOwner, {
                println("Get resp " + it)
            })

            //Create book object
            val updatedBook = BookItem(
                args.currentBook.id,
                bookName,
                bookAuthor,
                args.currentBook.desc,
                args.currentBook.image,
                bookRating,
                args.currentBook.dateCreated,
                bookFinished
            )

            //update current book
            mBookViewModel.updateBook(updatedBook)

            Toast.makeText(requireContext(), "Updated book successfully!", Toast.LENGTH_SHORT)
                .show()

            //navigate back
            findNavController().navigate(R.id.action_updateFragment_to_listFragment)

I am navigating back to another fragment before I can observe any changes from the HTTP response. This causes the observer to stop observing any changes, and thus I can't get a response. I just need to put my code inside the callback, so I can do something with the data I received. Like so:

            //Get description and image from API
            mBookViewModel.response.observe(viewLifecycleOwner, {
                println("Get resp " + it)
          

            //Create book object
            val updatedBook = BookItem(
                args.currentBook.id,
                bookName,
                bookAuthor,
                args.currentBook.desc,
                args.currentBook.image,
                bookRating,
                args.currentBook.dateCreated,
                bookFinished
            )

            //update current book
            mBookViewModel.updateBook(updatedBook)

            Toast.makeText(requireContext(), "Updated book successfully!", Toast.LENGTH_SHORT)
                .show()

            //navigate back
            findNavController().navigate(R.id.action_updateFragment_to_listFragment)
 })

Hopefully this helps out anyone who has just started out learning LiveData and using HTTP requests.

Retrofit 2.0 nested json with different subtypes

set your data variable datatype Map<String, Champion> instead of setting it object or List and add below getter method into your model to retrieve List<Champion>

public List<Champion> getChampions(){
    if(data != null){
        return new ArrayList<Value>(data.values());
    }
    return null; // you can set return new ArrayList<>(); to avoid null exception 
}

Retrofit 2.0 Can't parse Json nested object

Why are you defining two fields with the same name (="name")?
BTW,Your class should be something like this:

public class Repo{
     private long id;
     private String name;
     private String full_name;
     private Owner owner;
     private Parent parent;

     public class Parent{
          private String name;
          private String full_name;
          private Owner owner;
     }

     public class Owner{
          private long id;
          private String login;
     }
}

how to retrieve nested json object with retrofit?

Two ways:

1. make contact and location an inner class (same file), but the fields will still not be easily accessed from outside.

2. you can instead create a method to access the attributes in contacts from Address.

I use http://www.jsonschema2pojo.org/ to auto generate the files below

public class Address {

    // create a method here to get first/last name
    public String getFirstName(){ 
        return primaryContact==null? "" : 
               primaryContact.getFirstName(); 
    }
    // do the same for which ever inner attributes you like to access.

@SerializedName("name")
@Expose
private String name;
@SerializedName("address")
@Expose
private String address;
@SerializedName("location")
@Expose
private Location location;
@SerializedName("email")
@Expose
private String email;
@SerializedName("primaryContact")
@Expose
private PrimaryContact primaryContact;

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}

public String getAddress() {
return address;
}

public void setAddress(String address) {
this.address = address;
}

public Location getLocation() {
return location;
}

public void setLocation(Location location) {
this.location = location;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public PrimaryContact getPrimaryContact() {
return primaryContact;
}

public void setPrimaryContact(PrimaryContact primaryContact) {
this.primaryContact = primaryContact;
}

}
-----------------------------------com.example.Location.java-----------------------------------

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class Location {

@SerializedName("lon")
@Expose
private Double lon;
@SerializedName("lat")
@Expose
private Double lat;

public Double getLon() {
return lon;
}

public void setLon(Double lon) {
this.lon = lon;
}

public Double getLat() {
return lat;
}

public void setLat(Double lat) {
this.lat = lat;
}

}
-----------------------------------com.example.PrimaryContact.java-----------------------------------

package com.example;

import com.google.gson.annotations.Expose;
import com.google.gson.annotations.SerializedName;

public class PrimaryContact {

@SerializedName("firstName")
@Expose
private String firstName;
@SerializedName("lastName")
@Expose
private String lastName;
@SerializedName("jobTitle")
@Expose
private String jobTitle;
@SerializedName("email")
@Expose
private String email;
@SerializedName("photo")
@Expose
private String photo;

public String getFirstName() {
return firstName;
}

public void setFirstName(String firstName) {
this.firstName = firstName;
}

public String getLastName() {
return lastName;
}

public void setLastName(String lastName) {
this.lastName = lastName;
}

public String getJobTitle() {
return jobTitle;
}

public void setJobTitle(String jobTitle) {
this.jobTitle = jobTitle;
}

public String getEmail() {
return email;
}

public void setEmail(String email) {
this.email = email;
}

public String getPhoto() {
return photo;
}

public void setPhoto(String photo) {
this.photo = photo;
}

}

How do I parse nested objects with Retrofit 2?

Your POJO class should be like below.

public class Article {

@SerializedName("source")
@Expose
private Source source;
@SerializedName("author")
@Expose
private String author;
@SerializedName("title")
@Expose
private String title;
@SerializedName("description")
@Expose
private String description;
@SerializedName("url")
@Expose
private String url;
@SerializedName("urlToImage")
@Expose
private String urlToImage;
@SerializedName("publishedAt")
@Expose
private String publishedAt;
// your getter setter methods
}

Your NewsList POJO like below.

public class NewsList {

@SerializedName("status")
@Expose
private String status;
@SerializedName("articles")
@Expose
private List<Article> articles = null;
// getter setter
}

And your source POJO like below.

public class Source {

@SerializedName("id")
@Expose
private String id;
@SerializedName("name")
@Expose
private String name;
// getters setters 
}

Parsing nested JSON using RetroFit for Android

Turns out to be quite simple using the advice of @corsair992.

Create a custom deserializer to parse string into Json:

public class UserDeserializer implements JsonDeserializer<UserModel> {
    @Override
    public UserModel deserialize(JsonElement jsonElement, Type typeOF,
                                 JsonDeserializationContext context)
            throws JsonParseException {
        String userString = jsonElement.getAsString();
        JsonElement userJson = new JsonParser().parse(userString);

        return new Gson().fromJson(userJson, UserModel.class);
    }
}

then set it as a converter on your rest adapter:

RestAdapter restAdapter = new RestAdapter.Builder()
                .setLogLevel(RestAdapter.LogLevel.FULL)
                .setConverter(new GsonConverter(new GsonBuilder().registerTypeAdapter(UserModel.class, new UserDeserializer()).create()))
                .setEndpoint(getString(R.string.url_base))
                .build();

That will now convert the string into Json and make it function with the model.

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